From the vGrabber site, you use the Windows Control Panel to un-install the software.
#Remove vGrabber Toolbar (if you have it installed):
#*vGrabber's uninstall instructions --> http://www.vgrabber.com/faq.htm (''scroll down to "How do I uninstall the software"'')
#**Note the other links at the bottom of that section if you selected to install other bundled items during the original installation of vGrabber
#*http://support.mozilla.org/en-US/kb/Uninstalling+add-ons
#*http://support.mozilla.org/en-US/kb/Cannot%20uninstall%20an%20add-on
#*http://kb.mozillazine.org/Uninstalling_toolbars
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Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]